Effect of base paper filler content and precalendering on coating colour mist and coverage in MSP coating

The aim with this work was to determine the influence of base paper filler content (10, 15 and 20% and precalendering on coating layer formation and m etered size press (MSP) runnability at high machine speeds (1200-2000 m/min ). It was found that, by increasing the filler content in the base sheet, t he coating remained more on the surface of the paper and the variation it? coat weight distribution was reduced. Precalendering the base paper led to a 40% reduction in the roughness, but to a rather limited effect on the oil absorption (i, e, about 10%, reduction). However; the decreased base sheet oil absorption correlated well with a reduced variation in coat weight dis tribution and improved coating coverage. A reduced coating penetration, lea ving more nonimmobilized coating at the surface, also resulted in an increa sed tendency for colour mist at machine speeds above 1800 m/min.